const tagsView = {
  state: {
    visitedViews: [],
    cachedViews: []
  },

  mutations: {
    ADD_VISITED_VIEW: (state, view) => {
      if (state.visitedViews.some(v => v.path === view.path)) return
      state.visitedViews.push(
        Object.assign({}, view, {
          title: view.meta.title || "no-name"
        })
      )
    },
    ADD_CACHED_VIEW: (state, view) => {
      if (state.cachedViews.includes(view.name)) return
      if (!view.meta.noCache) {
        state.cachedViews.push(view.name)
      }
    },

    DEL_VISITED_VIEW: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews.splice(i, 1)
          break
        }
      }
    },
    DEL_CACHED_VIEW: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      index > -1 && state.cachedViews.splice(index, 1)
    },

    DEL_OTHERS_VISITED_VIEWS: (state, view) => {
      state.visitedViews = state.visitedViews.filter(v => {
        return v.meta.affix || v.path === view.path
      })
    },
    DEL_OTHERS_CACHED_VIEWS: (state, view) => {
      const index = state.cachedViews.indexOf(view.name)
      if (index > -1) {
        state.cachedViews = state.cachedViews.slice(index, index + 1)
      } else {
        // if index = -1, there is no cached tags
        state.cachedViews = []
      }
    },

    DEL_ALL_VISITED_VIEWS: state => {
      // keep affix tags
      state.visitedViews = state.visitedViews.filter(tag => tag.meta.affix)
    },
    DEL_ALL_CACHED_VIEWS: state => {
      state.cachedViews = []
    },

    UPDATE_VISITED_VIEW: (state, view) => {
      for (let v of state.visitedViews) {
        if (v.path === view.path) {
          v = Object.assign(v, view)
          break
        }
      }
    }
  },

  actions: {
    addView({ dispatch }, view) {
      dispatch("addVisitedView", view)
      dispatch("addCachedView", view)
    },
    addVisitedView({ commit }, view) {
      commit("ADD_VISITED_VIEW", view)
    },
    addCachedView({ commit }, view) {
      commit("ADD_CACHED_VIEW", view)
    },

    delView({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch("delVisitedView", view)
        dispatch("delCachedView", view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delVisitedView({ commit, state }, view) {
      return new Promise(resolve => {
        commit("DEL_VISITED_VIEW", view)
        resolve([...state.visitedViews])
      })
    },
    delCachedView({ commit, state }, view) {
      return new Promise(resolve => {
        commit("DEL_CACHED_VIEW", view)
        resolve([...state.cachedViews])
      })
    },

    delOthersViews({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch("delOthersVisitedViews", view)
        dispatch("delOthersCachedViews", view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delOthersVisitedViews({ commit, state }, view) {
      return new Promise(resolve => {
        commit("DEL_OTHERS_VISITED_VIEWS", view)
        resolve([...state.visitedViews])
      })
    },
    delOthersCachedViews({ commit, state }, view) {
      return new Promise(resolve => {
        commit("DEL_OTHERS_CACHED_VIEWS", view)
        resolve([...state.cachedViews])
      })
    },

    delAllViews({ dispatch, state }, view) {
      return new Promise(resolve => {
        dispatch("delAllVisitedViews", view)
        dispatch("delAllCachedViews", view)
        resolve({
          visitedViews: [...state.visitedViews],
          cachedViews: [...state.cachedViews]
        })
      })
    },
    delAllVisitedViews({ commit, state }) {
      return new Promise(resolve => {
        commit("DEL_ALL_VISITED_VIEWS")
        resolve([...state.visitedViews])
      })
    },
    delAllCachedViews({ commit, state }) {
      return new Promise(resolve => {
        commit("DEL_ALL_CACHED_VIEWS")
        resolve([...state.cachedViews])
      })
    },

    updateVisitedView({ commit }, view) {
      commit("UPDATE_VISITED_VIEW", view)
    }
  }
}

export default tagsView
